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为了探究尾矿胶凝活性,将生石灰、氢氧化钠、水玻璃和石膏等激发剂添加到湖南永州低品位氧化锰尾矿中,通过正交实验研究不同激发剂掺量对锰尾矿胶凝活性的激发效果。实验结果表明:当生石灰、氢氧化钠、水玻璃、石膏掺量分别为10%、2%、1.5%、6%时,锰尾矿基胶凝材料净浆试样的各个龄期抗压强度最大,28 d抗压强度可达到6.64 MPa,软化系数可达到0.81。SEM分析发现:低品位氧化锰尾矿基胶凝材料主要水化产物为钙矾石和水化硅酸钙凝胶,随着龄期延长,水化产物持续增加并相互交织搭接,内部缝隙减少,内部结构致密,提高了试样抗压强度和软化系数。
In order to explore the gelling activity of tailings, the activator such as quicklime, sodium hydroxide, water glass and gypsum was added to the low-grade manganese oxide tailings in Yongzhou, Hunan Province. The orthogonal experiments were carried out to study the effects of different activator dosages on the gelation of manganese tailings Active stimulating effect. The experimental results show that the compressive strength at various ages of the cement slurry of manganese tailing-based cementitious material when the dosage of lime, sodium hydroxide, water glass and gypsum are respectively 10%, 2%, 1.5% and 6% The maximum compressive strength at 28 d can reach 6.64 MPa and the softening coefficient can reach 0.81. SEM analysis shows that the main hydration products of low-grade manganese oxide tailings-based cementitious materials are ettringite and hydrated calcium silicate gels. With the prolongation of age, the hydration products continue to increase and intertwine with each other to reduce the internal cracks , The internal structure is compact, improve the sample compressive strength and softening coefficient.